### Abstract

The crystal structures and the microwave dielectric properties of the xSrTiO_{3}-(1 - x)Ca(Mg_{1/3}Nb_{2/3})O_{3} perovskite ceramic system have been investigated. In order to achieve a temperature-stable material, we studied a method of combining a positive temperature coefficient material with a negative one. SrTiO_{3} has dielectric properties of dielectric constant ε_{r} ∼ 205, Q × f value ∼ 4200 GHz and a large positive τ_{f} value ∼ 1700 ppm/°C. Ca(Mg_{1/3}Nb_{2/3})O_{3} possesses high dielectric constant (ε_{r} ∼ 28), high quality factor (Q × f value ∼ 58,000 at 7 GHz) and negative τ_{f} value (- 48 ppm/°C). As the x value varies from 0.2 to 0.8, the xSrTiO _{3}-(1 - x)Ca(Mg_{1/3}Nb_{2/3})O_{3} system has the dielectric properties as follows: 40 < ε_{r} < 123, 4600 < Q × f < 33,400 and - 23 < τ_{f} < 600. A new microwave dielectric material, 0.3SrTiO_{3}-0.7Ca(Mg _{1/3}Nb_{2/3})O_{3}, applicable in microwave devices is suggested and possesses the dielectric properties of a dielectric constant ε_{r} ∼ 46, a Q × f value ∼ 29,300 GHz (at 6.8 GHz) and a τ_{f} value ∼- 2 ppm/°C. A near-zero τ_{f} value can be achieved by adjusting the x value of xSrTiO_{3}-(1 - x)Ca(Mg_{1/3}Nb_{2/3})O_{3} ceramics.

Original language | English |
---|---|

Pages (from-to) | 1280-1283 |

Number of pages | 4 |

Journal | Materials Letters |

Volume | 60 |

Issue number | 9-10 |

DOIs | |

Publication status | Published - 2006 May 1 |

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### All Science Journal Classification (ASJC) codes

- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering

### Cite this

}

_{3}-(1 - X)Ca(Mg

_{1/3}Nb

_{2/3})O

_{3}ceramic system at microwave frequency',

*Materials Letters*, vol. 60, no. 9-10, pp. 1280-1283. https://doi.org/10.1016/j.matlet.2005.11.014

**New dielectric materials of xSrTiO _{3}-(1 - X)Ca(Mg _{1/3}Nb_{2/3})O_{3} ceramic system at microwave frequency.** / Wang, Jun Jie; Huang, Cheng-Liang.

Research output: Contribution to journal › Article

TY - JOUR

T1 - New dielectric materials of xSrTiO3-(1 - X)Ca(Mg 1/3Nb2/3)O3 ceramic system at microwave frequency

AU - Wang, Jun Jie

AU - Huang, Cheng-Liang

PY - 2006/5/1

Y1 - 2006/5/1

N2 - The crystal structures and the microwave dielectric properties of the xSrTiO3-(1 - x)Ca(Mg1/3Nb2/3)O3 perovskite ceramic system have been investigated. In order to achieve a temperature-stable material, we studied a method of combining a positive temperature coefficient material with a negative one. SrTiO3 has dielectric properties of dielectric constant εr ∼ 205, Q × f value ∼ 4200 GHz and a large positive τf value ∼ 1700 ppm/°C. Ca(Mg1/3Nb2/3)O3 possesses high dielectric constant (εr ∼ 28), high quality factor (Q × f value ∼ 58,000 at 7 GHz) and negative τf value (- 48 ppm/°C). As the x value varies from 0.2 to 0.8, the xSrTiO 3-(1 - x)Ca(Mg1/3Nb2/3)O3 system has the dielectric properties as follows: 40 < εr < 123, 4600 < Q × f < 33,400 and - 23 < τf < 600. A new microwave dielectric material, 0.3SrTiO3-0.7Ca(Mg 1/3Nb2/3)O3, applicable in microwave devices is suggested and possesses the dielectric properties of a dielectric constant εr ∼ 46, a Q × f value ∼ 29,300 GHz (at 6.8 GHz) and a τf value ∼- 2 ppm/°C. A near-zero τf value can be achieved by adjusting the x value of xSrTiO3-(1 - x)Ca(Mg1/3Nb2/3)O3 ceramics.

AB - The crystal structures and the microwave dielectric properties of the xSrTiO3-(1 - x)Ca(Mg1/3Nb2/3)O3 perovskite ceramic system have been investigated. In order to achieve a temperature-stable material, we studied a method of combining a positive temperature coefficient material with a negative one. SrTiO3 has dielectric properties of dielectric constant εr ∼ 205, Q × f value ∼ 4200 GHz and a large positive τf value ∼ 1700 ppm/°C. Ca(Mg1/3Nb2/3)O3 possesses high dielectric constant (εr ∼ 28), high quality factor (Q × f value ∼ 58,000 at 7 GHz) and negative τf value (- 48 ppm/°C). As the x value varies from 0.2 to 0.8, the xSrTiO 3-(1 - x)Ca(Mg1/3Nb2/3)O3 system has the dielectric properties as follows: 40 < εr < 123, 4600 < Q × f < 33,400 and - 23 < τf < 600. A new microwave dielectric material, 0.3SrTiO3-0.7Ca(Mg 1/3Nb2/3)O3, applicable in microwave devices is suggested and possesses the dielectric properties of a dielectric constant εr ∼ 46, a Q × f value ∼ 29,300 GHz (at 6.8 GHz) and a τf value ∼- 2 ppm/°C. A near-zero τf value can be achieved by adjusting the x value of xSrTiO3-(1 - x)Ca(Mg1/3Nb2/3)O3 ceramics.

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U2 - 10.1016/j.matlet.2005.11.014

DO - 10.1016/j.matlet.2005.11.014

M3 - Article

VL - 60

SP - 1280

EP - 1283

JO - Materials Letters

JF - Materials Letters

SN - 0167-577X

IS - 9-10

ER -